Michael Huettner, 23, was discovered on a bed surrounded by pill bottles in Macdonald’s Los Angeles home Thursday while the “Saturday Night Live” alum was traveling, TMZ reports.

Huettner’s parents found him after his girlfriend informed them he’d been house- and cat-sitting for Macdonald. Huettner was a close friend of Macdonald’s son, Dylan, 22.

Investigators saw no signs of criminal activity and suspect the cause of death to be an overdose of prescription drugs, including oxycodone, with which Huettner allegedly had issues in the past. Some drugs legally prescribed to Macdonald were found at the scene, though it’s unclear which drugs may have killed Huettner until toxicology results are released.

Macdonald and Dylan are said to be fully cooperating with the death investigation. A rep for Macdonald did not immediately return a request for comment.